Teaching Jharkhand (JSSC) PRT (1 to 5) Mock Test 2023 Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
If \(\rm \sin C=\frac{9}{10}\), then what is the value of cos2 C?
1
\(\frac{19}{100}\)
2
\(\frac{81}{\sqrt{19}}\)
3
\(\frac{19}{10}\)
4
\(\frac{\sqrt{19}}{100}\)